Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
phan thanh » pham thanh, ban thanh, van thanh
khoan cam » khoa cam, phan cam, thuan cam
ha thanh » va thanh, pham thanh, thi thanh
long dan » long doan, cong dan, nong dan
khoan va » doan va, khoa ma, nhan va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien nhanh - canh trinh ((ha thanh) OR (phan thanh)) long dan ((khoan cam) or (khoan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh ((ha thanh) OR (phan thanh)) long dan ((khoan cam) OR (khoan va)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - canh trinh ((ha thanh) OR (phan thanh)) long dan ((khoan cam) or (khoan va))".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh ((ha thanh) OR (phan thanh)) long dan ((khoan cam) or (khoan va))*.